Ответ:
Объяснение:
cos4a-sin4a*ctg2a = cos²2a-sin²2a - 2sin2a *cos2a *cos2a/sin2a = cos²2a-sin²2a - 2cos²2a = -(cos²2a+sin²2a) = -1
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Ответ:
Объяснение:
cos4a-sin4a*ctg2a = cos²2a-sin²2a - 2sin2a *cos2a *cos2a/sin2a = cos²2a-sin²2a - 2cos²2a = -(cos²2a+sin²2a) = -1